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Quantitative Imaging Using a 2.45 GHzPlanar Camera
Mälardalens högskola, Akademin för innovation, design och teknik. (Inteligent Sensor Systems)
2007 (Engelska)Ingår i: 5th World Congress on Industrial Process Tomography, Bergen, Norway, Bergen, Norway, 2007, , s. 8Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
Abstract [en]

Microwave imaging is recognized as an efficient diagnostic modality for no invasively visualizingdielectric contrasts in non metallic bodies. The usefulness of this modality results from the existingcorrelation between dielectric properties and quantities of practical relevance for industrial orbiomedical applications. At the beginning of the 80’s, Supélec developed a 2.45 GHz planarmicrowave camera, in the 90’s the group developed algorithms for quantitative microwave imaging.The purpose of this study is to investigate the capability of these existing materials, or an extendedversion of it, in terms of quantitative imaging of high contrast inhomogeneous object for application ofbreast cancer detection.

Ort, förlag, år, upplaga, sidor
Bergen, Norway, 2007. , s. 8
Serie
World Congress on Industrial Process Tomography ; 5
Nyckelord [en]
Quantitative Microwave Imaging, Planar Microwave Camera, Breast Tumor Detection, Newton-Kantorovich algorithm
Nationell ämneskategori
Annan elektroteknik och elektronik
Forskningsämne
Elektronik
Identifikatorer
URN: urn:nbn:se:mdh:diva-5877OAI: oai:DiVA.org:mdh-5877DiVA, id: diva2:217272
Projekt
Microwaves in biomedicineTillgänglig från: 2009-05-13 Skapad: 2009-05-13 Senast uppdaterad: 2009-05-13Bibliografiskt granskad
Ingår i avhandling
1. CONTRIBUTION TO QUANTITATIVE MICROWAVE IMAGING TECHNIQUES FOR BIOMEDICAL APPLICATIONS
Öppna denna publikation i ny flik eller fönster >>CONTRIBUTION TO QUANTITATIVE MICROWAVE IMAGING TECHNIQUES FOR BIOMEDICAL APPLICATIONS
2009 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This dissertation presents a contribution to quantitative microwave imaging for breast tumor detection. The study made in the frame of a joint supervision Ph.D. thesis between University Paris-SUD 11 (France) and Mälardalen University (Sweden), has been conducted through two experimental microwave imaging setups, the existing 2.45 GHz planar camera (France) and the multi-frequency flexible robotic system, (Sweden), under development. In this context a 2D scalar flexible numerical tool based on a Newton-Kantorovich (NK) scheme, has been developed.

Quantitative microwave imaging is a three dimensional vectorial nonlinear inverse scattering problem, where the complex permittivity of an object is reconstructed from the measured scattered field, produced by the object. The NK scheme is used in order to deal with the nonlinearity and the ill-posed nature of this problem. A TM polarization and a two dimensional medium configuration have been considered in order to avoid its vectorial aspect. The solution is found iteratively by minimizing the square norm of the error with respect to the scattered field data. Consequently, the convergence of such iterative process requires, at least two conditions. First, an efficient calibration of the experimental system has to be associated to the minimization of model errors. Second, the mean square difference of the scattered field introduced by the presence of the tumor has to be large enough, according to the sensitivity of the imaging system.

The existing planar camera associated to a flexible 2D scalar NK code, are considered as an experimental platform for quantitative breast imaging. A preliminary numerical study shows that the multi-view planar system is quite efficient for realistic breast tumor phantoms, according to its characteristics (frequency, planar geometry and water as a coupling medium), as long as realistic noisy data are considered. Furthermore, a multi-incidence planar system, more appropriate in term of antenna-array arrangement, is proposed and its concept is numerically validated.

On the other hand, an experimental work which includes a new fluid-mixture for the realization of a narrow band cylindrical breast phantom, a deep investigation in the calibration process and model error minimization, is presented. This conducts to the first quantitative reconstruction of a realistic breast phantom by using multi-view data from the planar camera. Next, both the qualitative and quantitative reconstruction of 3D inclusions into the cylindrical breast phantom, by using data from all the retina, are shown and discussed. Finally, the extended work towards the flexible robotic system is presented.

Ort, förlag, år, upplaga, sidor
Västerås: Mälardalen University, 2009. s. 113
Serie
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 73
Nyckelord
Quantitative Microwave Imaging. Inverse Problems, Nonliear Inverse Scattering, Diffraction Tomography, Breast Tumor Detection, Biomedical Imaging, Mammography, Calibration, Modeling, Planar 2.45 GHz Microwave Camera, Robot-based flexible multi-frequency data acquisition
Nationell ämneskategori
Annan elektroteknik och elektronik
Forskningsämne
Elektronik
Identifikatorer
urn:nbn:se:mdh:diva-5882 (URN)978-91-86135-27-0 (ISBN)
Disputation
2009-06-09, Lambda, Högskoleplan 1, Västerås, 09:30 (Engelska)
Opponent
Handledare
Projekt
Microwaves in biomedicine
Anmärkning
A dissertation prepared through an international convention for a joint supervision thesis with Université Paris-SUD 11, FranceTillgänglig från: 2009-05-14 Skapad: 2009-05-13 Senast uppdaterad: 2009-05-25Bibliografiskt granskad

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